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WWW interactive learning environments for computer science education 96

WWW interactive learning environments for computer science e...

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Proceedings of the twenty-seventh SIGCSE technical symposium on Computer science education

作者： David Carlson Mark Guzdial Colleen Kehoe Viren Shah John Stasko Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology Atlanta GA

ISBN: (纸本)9780897917575

The wide accessibility of the World Wide Web makes it a perfect base for developing computer science courseware modules. Since learning involves more than just receiving transmitted information, courseware must be interactive and encourage student engagement, which is a challenge on the Web architecture. This article describes an ongoing effort to develop World Wide Web-based computer science courseware modules that will use interactive components as integral parts of the material, in order to promote student involvement. It also discusses the proposed usage of new technology such as HotJava in this framework.

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Using student-built algorithm animations as learning aids 97

Using student-built algorithm animations as learning aids

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Proceedings of the twenty-eighth SIGCSE technical symposium on Computer science education

作者： John T. Stasko Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology Atlanta GA

ISBN: (纸本)9780897918893

The typical application of algorithm animation to assist instruction involves students viewing already prepared animations. An alternative strategy is to have the students themselves construct animations of algorithms. The Samba algorithm animation tool fosters such student-built animations. Samba was used in an undergraduate algorithms course in which students constructed algorithm animations as regular class assignments. This article describes Samba and documents our experiences using it in the algorithms course. Student reaction to the animation assignments was very positive, and the students appeared to learn the pertinent algorithms extremely well.

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A comparison of unscented and extended Kalman filtering for estimating quaternion motion

A comparison of unscented and extended Kalman filtering for ...

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American Control Conference (ACC)

作者： J.J. LaViola For Advanced Scientific Computing and Visualization Brown University Technology Center Providence RI USA

The unscented Kalman filter is a superior alternative to the extended Kalman filter for a variety of estimation and control problems. However, its effectiveness for improving human motion tracking for virtual reality applications in the presence of noisy data has been unexplored. In this paper, we present an empirical study comparing the performance of unscented and extended Kalman filtering for improving human head and hand tracking. Specifically, we examine human head and hand orientation motion signals, represented with quaternions, which are critical for correct viewing perspectives in virtual reality. Our experimental results and analysis indicate that unscented Kalman filtering performs equivalently with extended Kalman filtering. However, the additional computational overhead of the unscented Kalman filter and quasi-linear nature of the quaternion dynamics lead to the conclusion that the extended Kalman filter is a better choice for estimating quaternion motion in virtual reality applications.

关键词： Kalman filters Filtering Motion estimation Quaternions Virtual reality Humans Tracking Head Application software Jacobian matrices

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Real-time, continuous level of detail rendering of height fields 96

Real-time, continuous level of detail rendering of height fi...

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23rd Annual Conference on Computer Graphics and Interactive Techniques, SIGGRAPH 1996

作者： Lindstrom, Peter Koller, David Ribarsky, William Hodges, Larry F. Faust, Nick Turner, Gregory A. Graphics Visualization and Usability Center Georgia Institute of Technology College of Computing AtlantaGA30332-0280 United States Georgia Tech Research Institute Center for GIS and Spatial Analysis Technologies United States Simulation Technology Division United States

ISBN: (纸本)0897917464

We present an algorithm for real-time level of detail reduction and display of high-complexity polygonal surface data. The algorithm uses a compact and efficient regular grid representation, and employs a variable screen-space threshold to bound the maximum error of the projected image. A coarse level of simplification is performed to select discrete levels of detail for blocks of the surface mesh, followed by further simplification through repolygonalization in which individual mesh vertices are considered for removal. These steps compute and generate the appropriate level of detail dynamically in real-time, minimizing the number of rendered polygons and allowing for smooth changes in resolution across areas of the surface. The algorithm has been implemented for approximating and rendering digital terrain models and other height fields, and consistently performs at interactive frame rates with high image quality. © 1996 ACM.

关键词： Rendering (computer graphics)

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Using texture maps to correct for optical distortion in head-mounted displays

Using texture maps to correct for optical distortion in head...

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IEEE Annual International Symposium Virtual Reality

作者： B.A. Watson L.F. Hodges Graphics Visualization & Usability Center College of Computing Georgia Institute of Technology Atlanta GA USA

This paper describes a fast method of correcting for optical distortion in head-mounted displays (HMDs). Since the distorted display surface in an HMD is not rectilinear, the shape and location of the graphics window used with the display must be chosen carefully, and some corrections made to the predistortion model. A distortion correction might be performed with optics that reverse the distortion caused by HMD lenses, but such optics can be expensive and offer a correction for only one specific HMD. Integer incremental methods or a lookup table might be used to calculate the correction, but an I/O bottleneck makes this impractical in software. Instead, a texture map may be defined that approximates the required optical correction. Recent equipment advances allow undistorted images to be input into texture mapping hardware at interactive rates. Built in filtering handles predistortion aliasing artifacts.

关键词： Optical distortion Optical filters Displays Predistortion Shape Graphics Lenses Table lookup Hardware Filtering

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A robust high-order discontinuous Galerkin solver for fluid flow with cavitation 9

A robust high-order discontinuous Galerkin solver for fluid ...

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9th International Conference on Computational Fluid Dynamics, ICCFD 2016

作者： Hoffmann, Malte Boblest, Sebastian Offenhäuser, Philipp Munz, Claus-Dieter Institute of Aerodynamics and Gas Dynamics University of Stuttgart Pfaffenwaldring 21 Stuttgart70569 Germany Visualization Research Center University of Stuttgart Allmandring 19 Stuttgart70569 Germany High Performance Computing Center University of Stuttgart Nobelstrasse 19 Stuttgart70569 Germany

We present a computational fluid dynamics framework for the efficient and accurate simulation of multiphase flows. The compressible Navier-Stokes equations are solved with a Discontinuous Galerkin Spectral Element Method (DG-SEM). The system of governing equations is closed by the Helmholtz energy function, a highly accurate real multiparamter equation of state (EOS). This EOS covers liquid, vapor, liquid-vapor and supercritical regions. Thermodynamic equilibrium is assumed in the multiphase region and a dense gas approach is used to represent both phases in the solver. The EOS is evaluated and stored in a table during a parallelized preprocessing step, which we discuss in detail. A strategy for efficiently building the needed tables during calculation and post-processing is presented. During phase-change, high gradients are possible, which cannot be handled by the DG-SEM. To handle these, a 2nd order finite-volume shock-capturing technique is used. 1D validation calculations are shown and also 2D and 3D use-case calculations on up to 6.000 cores. © 2016 9th International Conference on Computational Fluid Dynamics, ICCFD 2016 - Proceedings. All rights reserved.

关键词： Cavitation

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Applying algorithm animation techniques for program tracing, debugging, and understanding 93

Applying algorithm animation techniques for program tracing,...

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Proceedings of the 15th international conference on Software Engineering

作者： Sougata Mukherjea John T. Stasko Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology Atlanta GA

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Topology exploration with hierarchical landscapes

Topology exploration with hierarchical landscapes

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Workshop at SIGGRAPH Asia 2012, WASA 2012

作者： Demir, Dogan Beketayev, Kenes Weber, Gunther H. Bremer, Peer-Timo Pascucci, Valerio Hamann, Bernd Scientific Computing and Imaging Institute School of Computing University of Utah United States Computational Research Divisition Lawrence Berkeley National Laboratory United States Center for Applied Scientific Computing Lawrence Livermore National Laboratory United States Institute for Data Analysis and Visualization Computer Science Department University of California Davis CA United States

ISBN: (纸本)9781450318358

Topological landscapes have been proposed as a visual metaphor for contour trees that does not require an understanding of the theory involved in defining contour trees. The idea is to create a representative terrain with the same topological structure as a given contour tree. This representation exploits the natural human ability to interpret topography and results in an intuitive visualization of otherwise abstract information. However, topological landscapes still suffer from some of the same limitations as traditional contour tree visualization. Most notable is the fact that for complex functions landscapes can quickly become highly complex, exceeding the limits of human comprehension as well as the available computing resources. To address this challenge, we propose a new framework for the dynamic creation and visualization of hierarchical topological landscapes. Our system provides an interactive visualization of complex functions by utilizing a hierarchical decomposition of the contour tree as well as focus+context type interactions. For three dimensional data, we link the landscape display to flexible isosurface extraction in order to correlate terrain features with their corresponding three dimensional counterparts. We demonstrate the utility and versatility of our approach on a variety of both low and high dimensional data sets. © 2012 ACM.

关键词： visualization

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Applying algorithm animation techniques for program tracing, debugging, and understanding

Applying algorithm animation techniques for program tracing,...

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International Conference on Software Engineering (ICSE)

作者： S. Mukherjea J.T. Stasko Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology Atlanta GA USA

Algorithm animation presents a dynamic visualization of an algorithm or program. This work seeks to bridge the two domains of data structure display and algorithm animation. The application-specific nature of algorithm animation views could be a valuable debugging aid for software developers. A system called Lens was developed that allows programmers to rapidly develop animations of their programs. Lens supports application-specific semantic program views as seen in many algorithm animation systems, but does not require graphics programming. Lens is integrated with a system debugger to support iterative testing and refinement. The authors describe the conceptual model on which Lens is based, illustrate how program animations are built with Lens, and outline some of the implementation challenges the system presents.< >

关键词： Animation Lenses Data visualization Bridges Data structures Displays Software algorithms Software debugging Programming profession Iterative algorithms

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A Parallel Multi-View Rendering Architecture

A Parallel Multi-View Rendering Architecture

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Brazilian Symposium on Computer Graphics and Image Processing

作者： Wallace Lages Carlucio Cordeiro Dorgival Guedes Deep Computing Visualization Center Universidade Federal de Minas Gerais Belo Horizonte Brasil

We present an architecture for rendering multiple views efficiently on a cluster of GPUs. The original scene is sampled by virtual cameras which are used later to reconstruct the desired views. We show that this image... 详细信息

ISBN: (纸本)9780769533582

关键词： Virtual cameras Rendering Building construction ARCHITECTURE Scalability ecosystem-based approach content-based image retrieval Art Therapy Parallel Lines View

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